Has anyone had an experience with this? At any point in pregnancy? 

Last night I was violently vomiting every hour for 5hrs starting at 1:30am,and suddenly back and abdominal pain set in around 7am.

It was very uncomfortable and would come on like contractions making my uterus very hard like a Rock.  

I would change positions, sit up,etc and nothing seemed to help. The pain would come on strong and last a good 20-45 seconds and happen again every 3-5 minutes later. 

It's now 9pm and while I have some back achiness,Headache, neck ache and some slight cramps I feel fine. 

Any insight of what the hell went on with me last night?Also I went to the hospital today around 3 and I was put on fluid then I went home after 2 hour.